I just bought a 2002 m3 conv smg and the nav disc keeps ejecting every time I turn the key on. The disc looks clean and Thr dealer wants 150 plus core charge for a refurbished nav cd drive, the unit in the trunk. Are there any other options? Thanks.

I just bought a 2002 m3 conv smg and the nav disc keeps ejecting every time I turn the key on. The disc looks clean and Thr dealer wants 150 plus core charge for a refurbished nav cd drive, the unit in the trunk. Are there any other options? Thanks.